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MEDIUM VOLTAGE TRANSFORMER PAIR

Publishing Venue

The IP.com Prior Art Database

Abstract

Various systems that are power sensitive may require multiple power sources. Multiple power sources may be primary and secondary power grid connections, generators, battery backup systems and/or auxiliary power units. Common power sensitive systems include information technology, computer systems, server systems, medical devices and hospital systems. This multiple source transfer system does not provide a dedicated preferred source and allows for maintenance while keeping a primary load connected. The multiple source transfer system may be a Medium Voltage Transfer Pair for selection between two sources automatically by use of a programmable logic controller (PLC). A load break junction assembly is included to allow for disconnection of incoming sources during maintenance and physically isolating the control cabinet or switching system.

Country

United States

Language

English (United States)

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This is the abbreviated version, containing approximately
27% of the total text.

MEDIUM
VOLTAGE TRANSFORMER PAIR

ABSTRACT

Various
systems that are power sensitive may require multiple power sources. Multiple power sources may be primary and
secondary power grid connections, generators, battery backup systems and/or
auxiliary power units. Common power
sensitive systems include information technology, computer systems, server
systems, medical devices and hospital systems. This multiple source transfer system does not
provide a dedicated preferred source and allows for maintenance while keeping a
primary load connected. The multiple
source transfer system may be a Medium Voltage Transfer Pair for selection
between two sources automatically by use of a programmable logic controller
(PLC). A load break junction assembly is
included to allow for disconnection of incoming sources during maintenance and
physically isolating the control cabinet or switching system.

BACKGROUND

Multiple Source
transfer or MVTP (Medium Voltage Transfer Pair) equipment is commonly used for
emergency power systems, Life Safety Systems, legally required standby systems,
and/or power outage sensitive equipment to allow the operational equipment to
be operated from more than one power source in event of a failure of power
sources. Maintaining Multiple Source
transfer equipment generally requires cleaning, calibration, testing, repair,
troubleshooting, re-torquing of cable/wiring terminations, component
replacement, testing and lubrication of component's moving parts. Current multiple source transfer equipment is
designed without a selectable preferred source, which requires shutdown of the multiple
source transfer equipment in order to perform maintenance and repair interrupting
power to loads being served. Existing
equipment is compliant to UL1008A and UL347.

INTRODUCTION

This MVTP system
will allow the equipment to be maintained and serviced without power
interruption to loads being served by the MVTP and allows for various
configurations by a configurable preferred source. Maintenance includes repair, calibration,
cleaning, component replacement, testing and component lubrication. The MVTP allows isolation of individual power
sections from power sources and control power without load shutdown. Control systems can also be maintained by
following described procedures during a partial shutdown for maintenance. Total Isolation of Power to a single power
section is achieved via a Loadbreak Junction Assembly and a procedure to switch
the preferred source.

DESCRIPTION

The MVTP includes
three sections: a Control Cabinet; a Power Section 1 and Power Section 2; and a
Loadbreak Junction Assembly, as shown in FIG. 1. Each section can be isolated for maintenance
requiring cleaning, calibration, testing, repair, troubleshooting, re-torquing
of cable/wiring terminations, component replacement, testing and lubrication of
component's moving parts. Power to the
section being maintained is isolated via the Loadbreak J...